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The physical properties of plutonium and plutonium-based intermetalliccompounds are extremely sensitive to temperature, pressure, and chemicalalloying. A celebrated example is the high-temperature $\delta$ phaseplutonium, which can be stabilized at room temperature by doping it with a fewpercent trivalent metal impurities, such as gallium or aluminum. The cubicphase Pu$_{3}$Ga, one of the plutonium-gallium intermetallic compounds, plays akey role in understanding the phase stability and phase transformation of theplutonium-gallium system. Its electronic structure might be essential to figureout the underlying mechanism that stabilizes the $\delta$ phaseplutonium-gallium alloy. In the present work, we studied thetemperature-dependent correlated electronic states of cubic phase Pu$_{3}$Ga bymeans of a combination of the density functional theory and the embeddeddynamical mean-field theory. We identified orbital selective 5$f$itinerant-localized (coherent-incoherent) crossovers which could occur upontemperature. Actually, there exist two well-separated electronic coherenttemperatures. The higher one is for the $5f_{5/2}$ state[$T_{\text{coh}}(5f_{5/2}) \approx 700$ K], while the lower one is for the$5f_{7/2}$ state [$T_{\text{coh}}(5f_{7/2}) \approx 100$ K]. In addition, thequasiparticle multiples which originate from the many-body transitions amongthe $5f^{4}$, $5f^{5}$, and $5f^{6}$ electronic configurations, decaygradually. The hybridizations between the localized 5$f$ bands and conductionbands are subdued by high temperature. Consequently, the Fermi surface topologyis changed, which signals a temperature-driven electronic Lifshitz transition.Finally, the calculated linear specific heat coefficient $\gamma$ isapproximately 112 mJ / (mol K$^2$) at $T = 80$ K.

Collapse of quasiparticle multiplets and $5f$ itinerant-localized crossovers in cubic phase Pu$_{3}$Ga